It sounds as if you need to use the ADC-100 adaptor for incompatible parallel ports. This adaptor is supplied with the unit.

When you are using this adaptor you will need to tell the computer so that it recognises that it is there. To do this you need to insert the following patch into the win.ini file:

[ADC100]
UseAdapter=Yes

You should insert the patch on a new line and exactly as written above. When you have done this, save the file and exit. The Picoscope software should now recognise the adaptor and report "Use Adapter" in Help | About. The ADC-100 should also now be functioning normally.